Improvement in punching-machines



PATENT OFFICE.

JAMES DUFF, 0F PEORIA, ILLINOIS.

IMPROVEMENT IN PUNCHING-MACHINES.

Specification forming part of Letters Patent No. 116,420, dated June 27, 1871.

To all uhom it may concern:

Be it known that I, JAMES DUFF, of the city of Peoria, in the county ot Peoria and in the State of Illinois, have invented an Improvement in Punching or Shearing Machines; and do hereby declare that the following is a full, clear, and exact description thereof, reference bein g had to the annexed drawing making a part of this specitication, in which like letters ot' reference refer to like parts, and in wliich- Figure 1 represents a side sectional elevation; Fig. 2, a front sectional elevation, Fig. 3, a plan View; and Fig. 4, a detailed view of arin, showing slot.

Like letters in thc figures of the drawing indicate like parts.

This invention relates to greater facility in op erating the toggle-joint in a punch or cutting press by making a side recess in the slot in the arin connecting the crank with toggle, into which the piu of the toggle is received, at pleasure of the oper ator, by which device the punch or shear can be kept moving verticalliv down to the spot intended to be cut or punched, marking, as it were, the precise point where the cut oi" the punch or cut will be made when the punch or shear is thrown into gear.

A is the frame of the lnachine, in the upper part of which is the toggle-joint D D, operated by the crank B. The punch or shear-guide is shown at z' and the bedplate at d d. B, the crank, to which is attached the arm C, the arm connecting toggle with crank B. c c is a slot running in the saine line as the arm. e is a continuation ofthe slot, down, at right angles, which is raised at pleasure to hug the pin d of' the toggle. D, the toggle-joint, attached above to the frame A, and below to the pin h of guide-,block E. F is a lever operated by the foot, and pivotcd at the lower part of the press, and connected, by a rod,

f, with the lever and dog (l, under the arni C, op-

erating on the l'attcr. 'This lever and dogare hung on the pin m.

The operation ol' this machine is as follows: In cuttingl or punching no eli'ect is produced by the operation ol' the crank and arin Gon the toggle, excepting to raise the punch or shear, and fall b v itsl own gravity, until the lever F is depressed. The latter beingdonc, the pin d of the toggle-joint is caught in the slot c. Then each horizontal nicvenient ol' the arni (l, operated by the crank B, causes the punch or shear to do its work.

The advantage of this invention is, that the punch or shearcan be continued in motion down to the lace ol' the object intended to be cut, but not cnt or punch until the exact place l'or cutting or punching is ascertained, asthc arm C lying on the pin d passes back and forth over the pin d until the dog G is raised, at which time the punch connes into operation.

Having thus full)v described luy invention, what I claim therein as new, and desire to secure by Letters Patent, is-

rhe crank B and arni C, constructed with the slots c c and c, as described, in combination with the pin d of' the toggle-joint D carrying the guideblock E with punch eeand dog G, connecting' by rod fwith lever F, all arranged and operating as shown and set forth.

In testimony that I claiin the foregoing punching or shearing machine I have hereunto set my hand this 13th day of July, A. I). 1870.

JAMES DUFF.

VWitnesses HENRY W. WELLS, En. THUELOW. 

